|Support type:||Scholarships in Brazil - Post-Doctorate|
|Effective date (Start):||November 01, 2011|
|Effective date (End):||October 31, 2014|
|Field of knowledge:||Biological Sciences - Botany - Pant Physiology|
|Principal Investigator:||Rafael Vasconcelos Ribeiro|
|Grantee:||Erick Espinoza Nuñez|
|Home Institution:||Instituto Agronômico (IAC). Agência Paulista de Tecnologia dos Agronegócios (APTA). Secretaria de Agricultura e Abastecimento (São Paulo - Estado). Campinas , SP, Brazil|
The earth's climate change will cause drought in many regions, reducing plant productivity and threatening the food security of millions of people. Researches to understand the physiology of plants under water stress will be useful to selection of drought tolerant materials and to guide transgenic plants researches. At the beginning of soil water deficit, plant roots produce signals that induce stomatal closure, which prevent excessive water losses. So, the study of signals is one of the most promising areas in the water-use efficiency in plants. The proposed research aims to evaluate the participation of hydraulic and chemical signals in the drought tolerance of two citrus rootstocks. To this end, two experiments will carry out: first, Valencia sweet orange, Rangpur lime and Swingle citrumelo seedlings will be grown with the root system split between two containers, with approximately half the system in each container. It will allow that half of the root system is expose to dry soil while the remaining half is irrigate. In the second experiment Valencia sweet orange seedlings will be inarching on two rootstocks (Rangpur lime and Swingle citrumelo), so it keeping the water deficit in one rootstock at a time. We will evaluate the water relations, gas exchange, hydraulic conductivity, growth, xylem ABA concentration, xylem pH, sap flow, and aquaporins expression.